Board Thread:Pokémon Help/@comment-26505627-20161108194554/@comment-26374715-20161110174954

Mudkip's line is better against Piplup's line, it becomes immune to first gym when you evolve(and it doesn't take that long either) and it has the type advantage over the 2nd and 4th gym. The only somewhat difficult one would be third, but it still wouldn't be that difficult since Marshtomp's only weakness is grass-type.